Add standalone netperf code directly within site_wifitest

client/config/wifi_testbed_config.cros-2

 # Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 #
 # A python dictionary that describes the wifi testbed setup.
 #
 {
   # client/netbook running Chrome OS
   "client"      : {
-    "addr"      : "172.22.18.36"
+    "addr"      : "172.22.18.50"
   },
   # machine on router net for ping/netperf
   "server"      : {
-#   "addr"      : "172.22.18.66",       # NB: not reachable
+    "addr"      : "172.22.18.66",       # NB: not reachable
     "wifi_addr" : "192.168.2.254"
   },
   # configurable wifi/router that can reached by ssh
   "router"      : {
     "addr"      : "172.22.18.102",
     "phydev2"   : "phy0",
     "phydev5"   : "phy1",
     "wiredev"   : "eth0",
   }
 }